linux-kernel - Re: [PATCH v6 5/5] MIPS: ranchu: Add Ranchu as a new generic-based board

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Date:   Thu, 2 Nov 2017 13:49:47 -0700
From:   Paul Burton <paul.burton@...s.com>
To:     Miodrag Dinic <Miodrag.Dinic@...s.com>
CC:     Aleksandar Markovic <aleksandar.markovic@...rk.com>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        Goran Ferenc <Goran.Ferenc@...s.com>,
        Aleksandar Markovic <Aleksandar.Markovic@...s.com>,
        "David S. Miller" <davem@...emloft.net>,
        Douglas Leung <Douglas.Leung@...s.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        James Hogan <James.Hogan@...s.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Miodrag Dinic <miodrag.dinic@...tec.com>,
        Paul Burton <paul.burton@...tec.com>,
        Petar Jovanovic <Petar.Jovanovic@...s.com>,
        Raghu Gandham <Raghu.Gandham@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v6 5/5] MIPS: ranchu: Add Ranchu as a new generic-based
 board

Hi Miodrag,

On Thu, Nov 02, 2017 at 06:47:05AM -0700, Miodrag Dinic wrote:
> > > +static const struct of_device_id ranchu_of_match[];
> > > +
> > > +MIPS_MACHINE(ranchu) = {
> > > +     .matches = ranchu_of_match,
> > > +     .measure_hpt_freq = ranchu_measure_hpt_freq,
> > > +};
> > > +
> > > +static const struct of_device_id ranchu_of_match[] = {
> > > +     {
> > > +             .compatible = "mti,ranchu",
> > > +             .data = &__mips_mach_ranchu,
> > > +     },
> > > +};
> > 
> > Could you move ranchu_of_match before the MIPS_MACHINE & drop the forward
> > declaration? That would feel tidier to me. It could also be marked as
> > __initdata.
> 
> We can not remove the forward declaration because we need to define
> __mips_mach_ranchu (which is done by MIPS_MACHINE(ranchu)) before ranchu_of_match.

Why? Why do you need to set the struct of_device_id data field? The generic
code only provides the match data to the machine fixup_fdt callback which you
don't implement, so the value is never used.

Thanks,
    Paul